This idea attempts to take a spin on the concept of another SCP-Verse God.

Quick Summary: The Foundation has contained an anomalous man who causes people nearby (or maybe in a radius) to suffer injures or deaths, or just anomalous events in a strange or comical manner.

Ex. Researcher X suffed a non-lethal heart attack after X was mysteriously dressed in a clown costume.
Ex. Researcher X was killed after the ceiling collapsed and a piano, being moved by staff, fell on top of him.
Ex. A baseball shattered SCP-XXXX's observation window, hitting Researcher X in the head. No suspect was found.

And other events of similar nature.

However, during an unfortunate incident (maybe a breach or an accident) SCP-XXXX was terminated. This resulted in a dimensional portal forming where SCP-XXXX has died, in the shape of SCP-XXXX's body, to an unknown place, where SCP-XXXX-1 inhabits and distorts reality to play tricks on personnel.

There might be some room for concept improvement. Let me know if there is.

It sounds absolutely beautiful. Funny, yet beautiful. There just needs to be a bit more explanation on who, what, or where SCP-XXXX-1 is.

If you don't know where an instance is, there is no way the instance can be properly documented. As well, is SCP-XXXX a person or a portal? If it's both, I would recommend the body being SCP-XXXX-A and the portal being SCP-XXXX-B.

I don't think I was clear enough on my post, so thanks for pointing that out. The person, or body, will be SCP-XXXX-A, and after SCP-XXXX-A was terminated, it formed the portal (SCP-XXXX-B).

I also will build upon the nature of SCP-XXXX-1, but I want it to be mysterious and just a little vague. My headcanon is that SCP-XXXX-1 is a "god" or entity that has omni-reality bending powers, but only in its dimension, and that SCP-XXXX-A was allowing its power to expand. This is subject to change though.

The Foundation has contained an anomalous man who causes people nearby (or maybe in a radius) to suffer injures or deaths,

Ehh… why does this happen though? If all you've got is the "it makes people hurt or die" effect, people might just see it as a generic overpowered humanoid. Why did it have this ability anyway? Does it have a backstory the way SCP-1440, a man who played cards with death, does?

SCP-XXXX-1 is a "god" or entity that has omni-reality bending powers, but only in its dimension, and that SCP-XXXX-A was allowing its power to expand

Okay, but then why did it use its powers to mess with Foundation staff and kill people? What does it gain by killing or injuring humans?

I personally don't think this will do well on the mainsite, mainly because I've seen a lot of similar ideas get deleted throughout the years. If you really want to make this work, probably will need to think up some more context regarding why this thing is the way it is.

UPDATE: This concept is going through a significant revamp. I should have posted this earlier, as Zyn's post ties in with the old concept.

Changes include.

SCP-XXXX's "anomalous events" no longer kill. Their main purpose is to just cause confusion and a bit of chaos in the facility. This will hopefully stray the idea away from generic X-men syndrome.

The entire concept of SCP-XXXX being neutralized and SCP-XXXX-1, the god, will be completely removed. After making my first draft, I felt like I shoe-horned the god into the document. I also feel like the god doesn't add much to the story.

Also Zyn pointed out the (possible) similarity to SCP-1440, which I knew was going to happen sooner of later. The god concept was suppose to prevent this, but I think removing the god and removing SCP-XXXX's ability to kill does the same thing.

I also want any advice on how I could style an interview on SCP-XXXX. I think removing the god concept, neutralization, and one interview in the draft can make the SCP feel kinda' short (though some SCPs can profit from being short). I plan to make most of the "substance" of the document focus on the weird things SCP-XXXX can cause.

Thanks for your criticism. Hopefully, this might lead to one of my first successful drafts.